Gas protective mask for animals, particularly for horses



June 30, 1931. H. STELZNER 1,312,380

GAS PROTECTIVE MASK FOR ANIMALS, PARTICULARLY FOR HORSES Filed Nov. 5,1928 2 Sheets-Sheet 1 6/ 6m, Pet

H. STELZNER 1,812,380 GAS PROTECTIVE MASK FOR ANIMALS, PARTI CULARLY FORHORSES.

June 30, 1931.

Filed Nov. 5, 192's 2 Sheets-Sheet 2 Patented June 30, 1931 UETE STATESPATENT OFFICE HEB/MANN STELZNER, OF LUBECK, GERMANY, ASSIGNOR TO DR.OTTO HEINRICH DBAGER, 0F LUBECK, GERMANY GAS PROTECTIVE Iv/IASK FORANIMALS, PARTICULARLY FOR HORSES Application filed November 5, 1928,Serial No.

The invention relates to a gas protective mask for animals, particularlyfor horses, which is constructed to embrace solely the upper jaw and thenose. Over known masks of this kind, the present mask difiers accordingto the invention, in the first instance by the provision of an elasticor yielding ti ghtening roll or pad which is passed through the mouthand is shaped to correspond to the 10 contour of the upper jaw embracingthe same all around and finding. its bearing in the corner of the mouth.This pad or roll may comprise av generally tube shaped mantle or coverfilled with an elastic material, however,

' 5 in such manner that its inner periphery or surface when formed tocorrespond to the upper jaw and nasal bone of the animal is smaller andmore yielding than the outer surface.

. Preferably the roll is made of a yielding ring 2b of felt or the likeof a mushroomor T-shaped cross-section, preferably comprising a broadtable or head-strip and an upright stay or web-strip enclosed within amantle or covering of leather or the like.

The mask is preferably constructed of a bag or pouch made of a materialimpermeable to gas and provided at its .front end with a filtercartridge. To avoid the snug fit or good seat of the pad being destroyedby the weight of the filter cartridge, the latter is provided with ayoke-like projection or the like, which finds a support against thenasal bone, the lower edge of .the filter cartridge being constructed tocarry a wall arranged at an angle to the inner surface of the cartridgeto prevent the lips from touching the cartridge.

Moreover the invention enables the application of the gas mask to thehorse in such manner, that the bridle need not be loosened or changed atany place,and that there is no necessity of using a bridle differentfrom the normal. This is of importance in the case of gas danger forenabling full-bridled horses to be quickly brought away from theendangered place. With this object in View the attachment of the mask iscarried out by a bandor the like placed over the nose and the foreheadand attached. with oneend to i the upper part of the tightening roll orpad 317,259, and in Germany November 10, 1927.

and with the other end to the main band of the bridle at the highestpoint, and moreover the attachment provides a loop-like band or thelike, the ends of which engage the sides of said roll, and the centre ofwhich is slung round thethroat band between the cheekbones. The loopedpart of the band is preferably strengthened by a filler of metal or thelike, which is bent in a plane essentially parallel to the surface ofthe band. may be rolled about the said filler and the edges sewedtogether, the seam being so twisted that the ends of the band remain ina position in which their faces are lying approximately parallel to oneanother and to the plane of the loop.

Fig. 1 of the drawing shows the mask ap plied to the head of the horsein elevation partly in section.

Fig. 2 is an enlarged sectional view of the lower part of the mask.

Fig. 8 is the rear View of the filter cartridge shown in Fig. 2.

Fig. 4 is a cross section of a modified filter cartridge. Fig. 5 is anelevation of a roll or pad used in connection with the invention.

Fig. 6 is a sectional enlarged perspective View of part of the roll thesectionbeing drawn to the line 66 of Fig. 5.

' I Fig. 7 is a similar view the section .being drawn to the line 77 ofFig. 5.

Figs. 8 and 9 are two different views of the band placed round thethroat band of the bridle and attached at one end to part of the maskshown in Fig. 1 to a larger scale. In the construction shown in Figs. 1and 2 the mask 1 embraces the upper jaw of the The band horse. Thetightening roll or pad 2 which is shaped to agree with the contour ofthe upper jaw passes through the mouth in such manner that it embracesthe upper jaw all round and bears in the corner of the mouth.

As may be gathered from Fig. 5 the pad has approximately the shape of arectangle with divers shapes of the upper jaw of animals,

mediate spaces 7 are filled up with rubber sponge; or with' a similaryieldlngi materia'l,v

which eventually maybe granular. VVhen the covering 4 is drawn togetherthe two felt strips 5' aud t will assumea cross-section of the shape ofa mushroom such as is shown in Figs.- 6 and 7 the'table or head strip 5will become curved on the edges and the complete crolss'esection of thepad corresponds somewhat to a triangle" having, curved sides and roundedofi' edges; on the corners of the essentially rectangularpad, that is tosay, where the sectional line 7'7 is shown, it varies in section fromthe centre part to the sides of the rectangle, where the sectional line66 is shown in 5a Namely in thecross-section shown in Fig. the table orhead strip 5- is thinner and the stay or web v strip 6 is thicker, thanis the case in the cross-section showninyFig- 7. The latter thus ismore; yielding, The: changes of the cross-section from that shown inFigi 5 to that shown in Fig. 7 are preferablyg-radA ual. The consequenceof this construction is moreover that the inner contour of the pad maybe comparatively easily disterted to the line 9' shown dotted in FigI-n'other' words the inner rectangle willbecome liarrower but longer.With horses the upper jaw of which has a smaller cross sectioninthe-plane of the pad,.than the largest dimen- -sion that might occurin masks, for which thepad is constructed/the pad 2 will be distorted,when it is drawn inya directionof the er-II A e y a b-e '8sh nin Fief- 5ol'fos's seotion, inte the oblique position 10 shown in dotted lines inFigs 1,, because the corners of; the pad" corresponding, to"the' sectionline 6 6 of the pad has; the least resistability against bending.rMoreover there is the advantage that owing to the sectional shape ofthe pad the creation of folds, partioularly on the corners, is'reliablyprevented. The pad 2thus is narrower and more yieldon its inner contourthan on the outer .ace. 7

:T e mask" carries at its front end a filter cartridge, which in theconstruction shown in Fig.4; comprises a cups or dish-like bottom part12' provided with a sieve-plate 11 and a flat sieve-lidll Both; consistof light metal and are held together byiset sorews 14;. The inner spacewhich is filled with chemical grains 1591* other absorption material issurrounde y a! r ng 6 of ar Gro -s r tion against which the sieve plate11 and 13 bear, the first by an intermediate rubber packing ring 17 orthe like. When drawing the set screws 15 home the packing ring 17 iscompressed. The construction of the cartridge shown in Figs. 1 and 2differs from that shown in Fig. 4; only slightly. In the latter theU-shaped ring 16 is replaced by a narrow angular ring 18, whicheventually may also consist of a packing material.

An oblique wall 19 is attached to the lower inner edge of the cartridgefor preventing the contact of the lips of thehorse with the inner faceof the cartridge, thus providing an intermediate wedgershaped space ofair. To the upper edge of the cartridge a cap or bowl 20 is mounted,which may be integral with the portion 12 of the cartridge, and whichruns round similar to a yoke and protects the nostrils of the animal andis supported with its upper rounded edge 21' by the nasal bone. Thisedge 21 may be bordered by a soft fabric fastened by sewingto preventchafing or rubbing. The bowl 20 carries an exhaling valve 22 constructedtowork with ease.

The mask body proper 1 consists of ahoselike covering of a pliablematerial? impermeable to gas. The lower opening ofthis hose is spannedaround the cartridge and; fastened thereto,.for instance'by a wire 24:.The filter cartridge bein comparatively large-the mask body 1 is bent orgiven an angle 27, where it enters themuzz'le. To prevent injurieshy theteeth ofthe animal'that portion of mask material lying within the mouthis covered a plate 28 of steel or the-like, which='ma-y be perforated asshown. The wall 19 reaches about up to'the middle of the filtercartridge. The inhaled air takes its way, as is shown by arrows in Figs.1' and- 2, into the. nostrils. The wedge shaped space between theobliquewall 19 and the lower part of the mask material seryes as salivacollector.

The head-stall is connected with the mask by being fastened to the pad2, the band 31, which by a buckle-loop 32 engages the main band} of thebridle, running. between the ears down over the forehead and the nose,and beingattached at the centre of the maskat 301 Preferably by. buckles35, theends of: a band .36 are fastened on-the sides of the pad2 at341', which band; at its centre passes round the throat band 37 of thebridle intermediate of the cheek bones. The loop 38 is preferablystrengthened by a soft iron filler. This iron filler is so bent that itsmain plane runs essentially parallel to the; faces of the band 36. Thecentre part of this band may be rolled" or placed round the'soft ironfiller and its edges connected with one another'by sewing. The seam 39is sotwisted that the ends of the band 3 6 uphold their position sothatthe inner faces are parallel to one'another and to the main plane of thebent iron filler.- Hereby the inconvenient pressure and chafingprevented, and a snugly flat bearing of the 36 on the head is secured.

The throat band is supported against the cheek bones at its lower partand the round cross section of the loop 38 prevents any pressure againstthe bronchial artery or pipe of the lungs.

I claim:

1. A gas protective mask for animals, particularly for horses, which isadapted to encompass the upper jaw and nose of the animal, said maskcomprising a bag of material impermeable to gas and having an opening ateach end, the opening at one end having a filter cartridge disposedtherein and the edges of the bag at the free opening at the other endhaving a roll or strip of padding attached thereto and extending aroundthe same, said strip of padding having a generally rectangular outlinein side elevation and being shaped to conform to the contour of theupper j aw and nose of the animal and being made of a mantle filled withelastic material, the inner periphery of the padding being more yieldingand more narrow than its outer periphery.

2. A gas protective mask for animals, par ticularly for horses, which isadapted to encompass the upper jaw and nose of the animal, said maskcomprising a bag of material impermeable to gas and having an opening ateach end, the opening at one end having a filter cartridge disposedtherein and the edges of the bag at the free opening at the other endhaving a roll or strip of padding attached thereto and extending aroundthe same, said strip of padding being shaped to conform to the contourof the upper jaw and nasal bone of the animal, the padding being made ofa generally tube shaped mantle of flexible ma terial having a fillerwhich is mushroom or T-shaped in cross-section.

3. A gas mask construction as claimed in claim 2 wherein the filling forthe padding comprises a fiat head strip and an upright web-strip made offelt, and sponge rubber or the like for filling the intermediate spacesbetween the mantle and the aforesaid strips.

4. A gas mask construction as claimed in claim 2 wherein the padding hasa substantially rectangular outline in side elevation and wherein thefilling for the padding com prises a fiat head strip and an uprightwebstrip, the head strip being thicker at the corners than along thesides and the webstrip being more narrow at the corners than along thesides.

5. A gas protective mask for animals, particularly horses, which isadapted to encompass the upper jaw and nose of the animal, said maskcomprising a bag of material impermeable to gas and having an opening ateach end, the opening at one end having a filter cartridge disposedtherein and the edge of the bag at the free opening at the other endhaving a roll or strip of padding at-- tached thereto and extendingaround the same, said strip of padding being shaped to conform to thecontour of the upper jaw and nasal bone of the animal, and a projectingyoke attached to said filter cartridge and extending inwardly therefromwithin the bag to bear upon the nasal bone of the animal and cooperatingwith the bag to support the cartridge.

6. A structure as claimed in claim 5 wherein the cartridge is providedwith an oblique wall attached to its lower inner edge, said wall beingadapted to prevent the lips of the animal from contacting with thecartridge.

7. A structure as claimed in claim 5 wherein the yoke surrounds. thenostrils of the animal and s11 ports an exhaling valve extending throngthe bag.

In testimony whereof I have signed my name to this specification.

HERMANN STELZNER.

